Datasheet LTC3832, LTC3832-1 (Analog Devices) - 3

LTC3832/LTC3832-1
ELECTRICAL CHARACTERISTICS The
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denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC, PVCC1, PVCC2 = 5V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVCC Supply Current Figure 2, VSHDN = VCC ● 0.7 1.6 mA VSHDN = 0V ● 1 10 µA IPVCC PVCC Supply Current Figure 2, VSHDN = VCC (Note 3) ● 20 30 mA VSHDN = 0V ● 0.1 10 µA fOSC Internal Oscillator Frequency FREQSET Floating ● 230 300 360 kHz VSAWL VCOMP at Minimum Duty Cycle 1.2 V VSAWH VCOMP at Maximum Duty Cycle 2.2 V VCOMPMAX Maximum VCOMP VFB = 0V, PVCC1 = 8V 2.85 V ∆fOSC/∆IFREQSET Frequency Adjustment 10 kHz/µA AV Error Amplifier Open-Loop DC Gain Measured from FB to COMP, ● 50 65 dB SENSE+ and SENSE– Floating, (Note 4) gm Error Amplifier Transconductance Measured from FB to COMP, ● 1600 2000 2400 µmho SENSE+ and SENSE– Floating, (Note 4) ICOMP Error Amplifier Output Sink/Source Current 100 µA IMAX IMAX Sink Current VIMAX = VCC 8 12 16 µA (Note 10) ● 4 12 20 µA IMAX Sink Current Tempco VIMAX = VCC (Note 6) 3300 ppm/°C VIH SHDN Input High Voltage ● 2.4 V VIL SHDN Input Low Voltage ● 0.8 V IIN SHDN Input Current VSHDN = VCC ● 0.1 1 µA ISS Soft-Start Source Current VSS = 0V, VIMAX = 0V, VIFB = VCC ● –8 –12 –18 µA ISSIL Maximum Soft-Start Sink Current VIMAX = VCC, VIFB = 0V, 1.6 mA In Current Limit VSS = VCC (Note 8), PVCC1 = 8V RSENSE SENSE Input Resistance 23.7 kΩ RSENSEFB SENSE to FB Resistance 18 kΩ tr, tf Driver Rise/Fall Time Figure 2, PVCC1 = PVCC2 = 5V (Note 5) ● 80 250 ns tNOV Driver Nonoverlap Time Figure 2, PVCC1 = PVCC2 = 5V (Note 5) ● 25 120 250 ns DCMAX Maximum G1 Duty Cycle Figure 2, VFB = 0V (Note 5), PVCC1 = 8V ● 91 95 %
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 7:
PVCC1 must be higher than VCC by at least 2.5V for G1 to operate of a device may be impaired. at 95% maximum duty cycle and for the current limit protection circuit to
Note 2:
All currents into device pins are positive; all currents out of device be active. pins are negative. All voltages are referenced to ground unless otherwise
Note 8:
The current limiting amplifier can sink but cannot source current. specified. Under normal (not current limited) operation, the output current will be
Note 3:
Supply current in normal operation is dominated by the current zero. needed to charge and discharge the external FET gates. This will vary with
Note 9:
The LTC3832E/LTC3832-1E are guaranteed to meet performance the LTC3832 operating frequency, operating voltage and the external FETs specifications from 0°C to 70°C. Specifications over the –40°C to 85°C used. operating temperature range are assured by design, characterization and
Note 4:
The open-loop DC gain and transconductance from the SENSE+ correlation with statistical process controls. and SENSE– pins to COMP pin will be (AV)(0.6/2.5) and (gm)(0.6/2.5)
Note 10:
The minimum and maximum limits for IMAX over temperature respectively. includes the intentional temperature coefficient of 3300ppm/°C. This
Note 5:
Rise and fall times are measured using 10% and 90% levels. Duty induced temperature coefficient counteracts the typical temperature cycle and nonoverlap times are measured using 50% levels. coefficient of the external power MOSFET on-resistance. This results in a
Note 6:
Guaranteed by design, not subject to test. relatively flat current limit over temperature for the application. sn3832 3832fs 3